KR100710575B1 - Boiling prevention type piling method - Google Patents

Boiling prevention type piling method Download PDF

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KR100710575B1
KR100710575B1 KR1020060085378A KR20060085378A KR100710575B1 KR 100710575 B1 KR100710575 B1 KR 100710575B1 KR 1020060085378 A KR1020060085378 A KR 1020060085378A KR 20060085378 A KR20060085378 A KR 20060085378A KR 100710575 B1 KR100710575 B1 KR 100710575B1
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South Korea
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pile
excavation hole
tip
boiling
bishop
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KR1020060085378A
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Korean (ko)
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KR20060101429A (en
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정경문
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주식회사 도화종합기술공사
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    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
    • E02D5/22—Piles
    • E02D5/62—Compacting the soil at the footing or in or along a casing by forcing cement or like material through tubes
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
    • E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
    • E02D2250/00—Production methods
    • E02D2250/003—Injection of material

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  • Engineering & Computer Science (AREA)
  • Structural Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Mining & Mineral Resources (AREA)
  • Paleontology (AREA)
  • Civil Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Agronomy & Crop Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Soil Sciences (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

본 발명은 지반에 관입되어 각종 구조물의 기초로 사용되는 말뚝에 관한 것으로, 말뚝의 관입을 위한 굴착공의 천공전에 말뚝의 선단부(先端部) 주변 지반에 부분적인 주교(注膠, grouting)를 실시함으로써, 굴착공의 완성시 굴착공의 저면에서 발생될 수 있는 보일링(boiling)현상을 방지한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile that is infiltrated into the ground and used as a basis for various structures, and before the drilling of an excavation hole for penetration of the pile, partial bishop is performed on the ground around the tip of the pile. By doing so, it is to prevent the phenomenon of boiling (boiling) that may occur at the bottom of the drilling hole when the completion of the drilling hole.

본 발명을 통하여 말뚝의 선단지지력을 획기적으로 향상시킬 수 있으며, 이로써 말뚝기초가 적용되는 각종 구조물의 구조적 성능 및 안정성을 제고하는 효과를 얻을 수 있다.Through the present invention it is possible to significantly improve the tip bearing capacity of the pile, thereby improving the structural performance and stability of the various structures to which the pile foundation is applied.

말뚝(pile), 주교(注膠), 보일링(boiling) Pile, bishop, boiling

Description

선단부 보일링 방지형 말뚝공법{Boiling prevention type piling method}Boiling prevention type piling method

도 1은 종래의 현장타설말뚝 시공과정도1 is a conventional cast-in-place pile construction process diagram

도 2는 굴착공 저부 보일링현상 설명도2 is an explanatory view of the bottom of the drilling boil phenomenon

도 3은 본 발명의 주요 시공과정 발췌 설명도Figure 3 is an explanatory view of the main construction process extract of the present invention

도 4는 본 발명의 굴착공 단면도4 is a cross-sectional view of the excavation hole of the present invention

<도면의 주요부분에 대한 부호설명><Code Description of Main Parts of Drawing>

11 : 굴착장비11: Excavation Equipment

12 : 케이싱12: casing

13 : 트레미(tremie)13: tremie

14 : 진동기14: vibrator

15 : 콘크리트15: concrete

21 : 주입관21: injection tube

26 : 철근26: rebar

29 : 주입재29: injection material

S11 : 주입관관입단계S11: injection pipe penetration step

S12 : 주교단계S12: Bishop

S21 : 천공단계S21: drilling step

본 발명은 지반에 관입되어 각종 구조물의 기초로 사용되는 말뚝에 관한 것으로, 말뚝의 관입을 위한 굴착공의 천공전에 말뚝의 선단부(先端部) 주변 지반에 부분적인 주교(注膠, grouting)를 실시함으로써, 굴착공의 완성시 굴착공의 저면에서 발생될 수 있는 보일링(boiling)현상을 방지한 것이다.BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pile that is infiltrated into the ground and used as a basis for various structures, and before the drilling of an excavation hole for penetration of the pile, partial bishop is performed on the ground around the tip of the pile. By doing so, it is to prevent the phenomenon of boiling (boiling) that may occur at the bottom of the drilling hole when the completion of the drilling hole.

말뚝은 그 외주면과 지반 사이의 마찰력인 주면마찰력과 말뚝 선단과 접한 지반의 지지력인 선단지지력에 의하여 기초로서의 역할을 수행하게 되며, 기 제작된 말뚝을 지반에 타입하거나, 지반에 굴착공을 형성한 후 기 제작된 말뚝의 삽입 또는 콘크리트의 타설을 실시하는 과정을 통하여 시공된다.The pile acts as a foundation by the main surface friction force, which is the frictional force between the outer circumferential surface and the ground, and the tip support force, which is the support force of the ground in contact with the tip of the pile. It is then constructed through the process of inserting the manufactured pile or placing concrete.

도 1에는 전술한 말뚝의 시공방법 중 현장타설말뚝의 시공과정이 도시되어 있으며, 이를 간략히 설명하면 다음과 같다.Figure 1 shows the construction process of the cast-in-place pile of the construction method of the above-described pile, briefly described as follows.

우선 지반에 굴착장비(11)를 통한 천공을 실시하는데, 굴착공의 공벽을 유지하기 위하여 케이싱(12)을 함께 관입시키면서 굴착공을 형성한다.First, drilling is carried out through the excavation equipment 11 on the ground, while forming the excavation hole while injecting the casing 12 together to maintain the vacant wall of the excavation hole.

목표심도까지의 굴착공이 완성되면, 조립된 철근(26)을 투입하고 트레미(tremie)(13)를 통하여 콘크리트(15)를 타설하면서 동시에 케이싱(12)을 인발하 게 된다.When the excavation hole to the target depth is completed, the assembled reinforcing bar (26) is put and the concrete (15) is poured through the tremie (13) while drawing the casing (12) at the same time.

케이싱(12)은 상단에 진동기(14)를 결합하여 진동을 가하면서 크레인 등을 통하여 인발하게 되고, 콘크리트(15)의 타설과 동시에 진행하여, 케이싱(12)의 인발이 완료되면 현장타설말뚝의 타설이 완성되며, 이후 소정의 양생기간을 거쳐 말뚝으로서의 역할을 수행하게 된다.The casing 12 is drawn through a crane or the like while applying vibration to the upper end of the vibrator 14, and proceeds simultaneously with the pouring of the concrete 15, and when the drawing of the casing 12 is completed, The casting is completed, and then serves as a pile through a predetermined curing period.

이렇듯, 기설 굴착공을 통한 말뚝의 시공은 시공의 정도(精度)가 높고, 소음 및 주변 구조물에 대한 충격이 적은 장점이 있어서 널리 사용되고 있으나, 도 2에서와 같이, 굴착공의 형성과 동시에 개시되는 보일링현상에 의하여 당초 계획된 선단지지력을 확보하지 못하는 문제가 있었다.As such, the construction of the pile through the existing excavation hole is widely used because of the high degree of construction (construction), less noise and less impact on the surrounding structure, as shown in Figure 2, is started simultaneously with the formation of the excavation hole Due to the boiling phenomenon, there was a problem in that it did not secure the planned end support.

즉, 계획심도까지 굴착 및 케이싱(12)의 관입이 완료되면, 본 말뚝의 타설전에 굴착장비(11)를 회수하고 철근(26)을 설치하는 등의 과정이 진행되는데 이 시간동안 굴착공의 저부에서는 굴착공 내부로 지하수가 유입되면서 굴착공 저면에 수포가 형성되는 보일링현상이 발생하게 되어, 주변의 토립자가 유실되고 지지력이 상실되게 되는 것이다.That is, when the excavation and penetration of the casing 12 is completed to the planned depth, the process of recovering the excavation equipment 11 and installing the reinforcing bar 26 before the placing of the pile proceeds. In the borehole, as the groundwater flows into the excavation hole, a boiling phenomenon occurs in which a blister is formed on the bottom of the excavation hole, and thus, the surrounding toll is lost and the support force is lost.

본 발명은 전술한 문제점을 해결하기 위하여 창안한 것으로, 말뚝의 설치를 위한 굴착공의 형성 전에 계획심도 주변에 주교를 실시함으로써, 굴착공의 완성시 저면을 통한 지하수유동을 근본적으로 방지한 것이다.The present invention has been devised to solve the above-mentioned problems, and by performing a bishop around the planned depth before the formation of the excavation hole for the installation of the pile, the groundwater flow through the bottom at the completion of the excavation hole is essentially prevented.

이러한 본 발명의 주교는 계획심도에 이르는 주입관을 지반에 관입한 후, 이 를 통하여 주입재의 주입을 실시하는 방식으로 이루어지며, 일반 주교와 달리, 주입관을 인발하면서 전 영역에 대한 주교를 실시하지 않고, 추후 설치될 말뚝의 선단부 주변의 지반에 대한 부분적인 주교만이 실시되며, 주입관의 관입을 위한 장비는 이후 진행될 본 말뚝의 설치를 위한 장비를 활용하게 되므로, 공사비의 증액은 미미하다.The bishop of the present invention is made by injecting the injection pipe to the ground, and then through the injection of the injection material through this, unlike the general bishop, the bishop for the entire area while drawing the injection pipe Instead, only a partial bishop of the ground around the tip of the pile to be installed later is carried out, and the equipment for injecting the injection pipe utilizes the equipment for the installation of the pile to be carried out later, so the increase in construction cost is insignificant. .

본 발명의 상세한 수행 과정을 첨부된 도면을 통하여 설명하면 다음과 같다.Detailed implementation of the present invention will be described with reference to the accompanying drawings.

본 발명은 말뚝의 본 시공 이전에 도 3에서와 같은 과정을 통한 주교를 실시함으로써 굴착공의 저면부를 통한 보일링을 방지하게 된다.The present invention is to prevent the boiling through the bottom of the excavation hole by performing the bishop through the process as in Figure 3 before the construction of the pile.

우선, 주입관(21)을 지반에 관입하게 되는데, 주입관(21)의 선단부는 말뚝의 계획심도에 도달하도록 한다.First, the injection pipe 21 is introduced into the ground, the tip of the injection pipe 21 to reach the planned depth of the pile.

주입관(21)의 관입이 완료되면, 이 주입관(21)을 통하여 시멘트액이나 물유리(water glass) 등의 주입재(29)를 고압으로 주입하게 되는데, 본 발명에 있어서 주교의 목적은 지반의 보강이나 수직면 형태의 차수벽을 구성하는 것이 아니라 추후 시공될 말뚝 선단부에 소폭의 차수층을 형성하는 것이므로, 주입관(21)을 인발하며 전 영역에 대한 주교를 실시할 필요는 없다.When the injection of the injection tube 21 is completed, the injection material 29, such as cement liquid or water glass, is injected through the injection tube 21 at high pressure. Since a small order layer is formed at the tip of the pile to be constructed later rather than forming a reinforcement or vertical shape order wall, it is not necessary to draw the injection pipe 21 and perform the bishop for the entire area.

즉, 고정된 상태의 주입관(21)에서 소량의 주입재(29)만을 주입하면 주교가 완료되며, 이후 주입관(21)은 인발한다.That is, when only a small amount of the injection material 29 is injected in the fixed injection tube 21, the bishop is completed, and then the injection tube 21 is drawn out.

주입관(21)을 인발한 후, 본 말뚝을 시공하기 위한 굴착공을 형성하고, 이 굴착공을 통하여 말뚝을 설치함으로써 작업이 완료되게 된다.After drawing the injection pipe 21, the drilling hole for constructing this pile is formed, and a work is completed by installing a pile through this drilling hole.

도 4는 본 발명에 의하여 형성된 굴착공을 도시한 것으로서, 굴착공의 저면부에 주입재(29)가 고결(固結)되어 지하수의 유입을 차단함을 알 수 있다.Figure 4 shows an excavation hole formed by the present invention, it can be seen that the injection material 29 is solidified in the bottom surface of the excavation hole to block the inflow of groundwater.

결국 본 발명의 기술요지는 지반에 굴착공을 형성한 후 이 굴착공을 통하여 말뚝을 설치하는 말뚝공법에 있어서, 굴착공의 계획 지점에 주입관(21)을 관입하되, 주입관(21)의 선단이 추후 설치될 말뚝의 선단부에 도달하도록 하는 주입관관입단계(S11)와, 주입관(21)을 통하여 주입재(29)를 주입하는 주교단계(S12)와, 주입관(21)을 인발한 후 말뚝의 시공을 위한 굴착공을 형성하는 천공단계(S21)가 포함됨을 특징으로 하는 선단부 보일링 방지형 말뚝공법이다.After all, the technical gist of the present invention, in the pile method for forming a pile through the excavation hole after the excavation hole is formed in the ground, injecting the injection tube 21 at the planned point of the excavation hole, Injection pipe penetration step (S11) for the tip to reach the tip of the pile to be installed later, the bishop step (S12) for injecting the injection material 29 through the injection pipe 21, and the injection pipe 21 It is a front end boiling prevention type pile method characterized in that it comprises a drilling step (S21) to form an excavation hole for the construction of the pile.

본 발명을 통하여 말뚝의 선단지지력을 획기적으로 향상시킬 수 있으며, 이로써 말뚝기초가 적용되는 각종 구조물의 구조적 성능 및 안정성을 제고하는 효과를 얻을 수 있다.Through the present invention it is possible to significantly improve the tip bearing capacity of the pile, thereby improving the structural performance and stability of the various structures to which the pile foundation is applied.

Claims (1)

지반에 굴착공을 형성한 후 이 굴착공을 통하여 말뚝을 설치하는 말뚝공법에 있어서,In the pile method of forming a pile through the excavation hole after forming an excavation hole in the ground, 굴착공의 계획 지점에 주입관(21)을 관입하되, 주입관(21)의 선단이 추후 설치될 말뚝의 선단부에 도달하도록 하는 주입관관입단계(S11)와;Injecting the injection pipe 21 into the planned point of the excavation hole, the injection pipe penetration step (S11) so that the tip of the injection pipe 21 reaches the tip of the pile to be installed later; 주입관(21)을 통하여 주입재(29)를 주입하는 주교단계(S12)와;Bishop step (S12) for injecting the injection material 29 through the injection pipe 21; 주입관(21)을 인발한 후 말뚝의 시공을 위한 굴착공을 형성하는 천공단계(S21)가 포함됨을 특징으로 하는 선단부 보일링 방지형 말뚝공법.Tip boil-proof pile method characterized in that it comprises a drilling step (S21) to form an excavation hole for the construction of the pile after drawing the injection pipe (21).
KR1020060085378A 2006-09-05 2006-09-05 Boiling prevention type piling method KR100710575B1 (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58113417A (en) * 1981-12-26 1983-07-06 Seiji Ichikawa Injection of grout
KR830007970A (en) * 1981-11-10 1983-11-09 와다루 나까니시 Soil hardening agent injection method (地盤 硬化 劑 注入 方法)
JPH05247925A (en) * 1992-03-09 1993-09-24 Shohei Senda Three-phase grouting method
KR20040073415A (en) * 2004-07-08 2004-08-19 동명특수건설 주식회사 Extracting casing after lower part curing type cast-in-place pile method
KR20060099889A (en) * 2005-03-15 2006-09-20 남기천 Structure and construction method of cut-off wall using jet grouting

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR830007970A (en) * 1981-11-10 1983-11-09 와다루 나까니시 Soil hardening agent injection method (地盤 硬化 劑 注入 方法)
JPS58113417A (en) * 1981-12-26 1983-07-06 Seiji Ichikawa Injection of grout
JPH05247925A (en) * 1992-03-09 1993-09-24 Shohei Senda Three-phase grouting method
KR20040073415A (en) * 2004-07-08 2004-08-19 동명특수건설 주식회사 Extracting casing after lower part curing type cast-in-place pile method
KR20060099889A (en) * 2005-03-15 2006-09-20 남기천 Structure and construction method of cut-off wall using jet grouting

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